# RAeS Events vs ∫dx

The clearest difference is in-app purchases: RAeS Events at none against ∫dx's 2. RAeS Events also leads on iOS requirement (10.0 vs 15.1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. ∫dx sells 2 in-app purchases, starting at $4.99 per month. RAeS Events asks for nothing beyond the download.

RAeS Events ships an update every 3 weeks, ∫dx monthly. The most recent releases landed on October 25, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | RAeS Events | ∫dx |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Size | 26 MB | 42 MB |
| Requires iOS | **10.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Royal Aeronautical Society](https://appshunter.io/developer/1287165363) | [PRANEEL AGRAWAL](https://appshunter.io/developer/1868893039) |

## What reviewers say

### RAeS Events

[App page](https://appshunter.io/ios/app/raes-events/id1530321019)

**Features:** macOS Compatibility

**In-app purchases:** none


### ∫dx

[App page](https://appshunter.io/ios/app/dx-a-level-maths-practice/id6758026965)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| dx Premium Monthly | $4.99 | per month |
| dx Premium Annual | $12.99 | per year |


## Frequently asked questions

### Is RAeS Events free?

RAeS Events is free to download, with no in-app purchases.

### Is ∫dx free?

∫dx is free to download, with in-app purchases available.

### Do RAeS Events or ∫dx have ads?

Neither RAeS Events nor ∫dx shows ads.

### Which is updated more often, RAeS Events or ∫dx?

RAeS Events ships an update every 3 weeks, and ∫dx monthly. Most recently, RAeS Events was updated on October 25, 2026 and ∫dx on October 31, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*